US3295975A - Black-and-white developer for photographic reversal processes - Google Patents
Black-and-white developer for photographic reversal processes Download PDFInfo
- Publication number
- US3295975A US3295975A US304660A US30466063A US3295975A US 3295975 A US3295975 A US 3295975A US 304660 A US304660 A US 304660A US 30466063 A US30466063 A US 30466063A US 3295975 A US3295975 A US 3295975A
- Authority
- US
- United States
- Prior art keywords
- developer
- pyrazolidone
- black
- photographic
- developing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title description 16
- 230000008569 process Effects 0.000 title description 15
- -1 SILVER HALIDE Chemical class 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 claims description 16
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 15
- NDGRWYRVNANFNB-UHFFFAOYSA-N pyrazolidin-3-one Chemical compound O=C1CCNN1 NDGRWYRVNANFNB-UHFFFAOYSA-N 0.000 claims description 14
- 229910052709 silver Inorganic materials 0.000 claims description 12
- 239000004332 silver Substances 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000009472 formulation Methods 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
- 230000003113 alkalizing effect Effects 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- CIUQDSCDWFSTQR-UHFFFAOYSA-N [C]1=CC=CC=C1 Chemical group [C]1=CC=CC=C1 CIUQDSCDWFSTQR-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 description 34
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 14
- 238000011161 development Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- CMCWWLVWPDLCRM-UHFFFAOYSA-N phenidone Chemical compound N1C(=O)CCN1C1=CC=CC=C1 CMCWWLVWPDLCRM-UHFFFAOYSA-N 0.000 description 7
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 6
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 6
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 5
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 5
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 229910021607 Silver chloride Inorganic materials 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 235000006708 antioxidants Nutrition 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 1
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 description 1
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- ZFIQGRISGKSVAG-UHFFFAOYSA-N 4-methylaminophenol Chemical compound CNC1=CC=C(O)C=C1 ZFIQGRISGKSVAG-UHFFFAOYSA-N 0.000 description 1
- CPELXLSAUQHCOX-UHFFFAOYSA-M Bromide Chemical compound [Br-] CPELXLSAUQHCOX-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 125000004442 acylamino group Chemical group 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 235000019646 color tone Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 150000004985 diamines Chemical class 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 239000008233 hard water Substances 0.000 description 1
- TVHALOSDPLTTSR-UHFFFAOYSA-H hexasodium;[oxido-[oxido(phosphonatooxy)phosphoryl]oxyphosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O TVHALOSDPLTTSR-UHFFFAOYSA-H 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- NXPHCVPFHOVZBC-UHFFFAOYSA-N hydroxylamine;sulfuric acid Chemical compound ON.OS(O)(=O)=O NXPHCVPFHOVZBC-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229940018564 m-phenylenediamine Drugs 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004987 o-phenylenediamines Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 239000000837 restrainer Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/29—Development processes or agents therefor
- G03C5/30—Developers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/29—Development processes or agents therefor
- G03C5/305—Additives other than developers
Definitions
- the invention relates to a blackand-white developer for the first development step of photographic reversal materials, more especially color reversal materials.
- black-and-white developers which are used for developing usual black-andwhite materials, so that new developers had to be discovered for the reversal process, more especially of color reversal materials.
- black-and-white developers which are intended to be used for the process under discussion may only contain a relatively small quantity of sulphites, since the dissolving of silver chloride by the action of these compounds is to be avoided.
- Developer substances which are widely used for normal black-andwhite development show disadvantageous eflects in connection with the present process, more especially when processing color reversal papers, and these efiects prevent their use in photographic reversal processes. For instance hydroquinone, for so far unexplained reasons, causes a non-uniform color formation in larger image areas having the same color.
- developer compositions which contain 3-pyrazolidones and o-phenylene diamine as developer substances are excellently suitable for the first black-and-white development of photographic reversal materials, in particular of color reversal papers. Due
- m-phenylene diamine and H p-phenylene diamine only cause a slight increase in o-Phenylene diamines which are substituted on the nucleus are also suitable for the developer composition according to the invention, but these generally produce a substantially smaller efiect than the unsubstituted compound.
- Suitable substituents are, for example, lower alkyl having up to 5 carbon atoms, lower alkoxy groups having up to 5 carbon atoms, halogen atoms such as chlorine or carboxyl groups which can be esterilied with a lower aliphatic alcohol having up to 5 carbon atoms.
- o-Phenylene diamine by itself at a pH of about 10.0 does not develop any silver halide.
- a particular advantage is offered by the combination of 3-pyrazolidones with o-phenylene diamine, when processing color reversal materials which contain a silver bromide emulsion as well as silver chloride emulsions in the several layers.
- the different types of emulsion layers are developed to equal extents.
- the first reversal developer according to the invention only forms photographically inactive oxidation products.
- R is a hydrogen atom, an alkyl group containing up to 4 carbon atoms or a phenyl group which can be substituted, for example, by chlorine, lower alkyl groups such as methyl or ethyl, and also lower alkoxy groups such as methoxy, amino, acylamino, for example, acetamino or hydroxy; and R to R represent hydrogen, alkyl radicals containing up to 4 carbon atoms or phenyl radicals.
- the following compounds exhibit particular utility 1-phenyl-3-pyrazolidone 5 -phenyl-3 -pyrazolidone 5-methyl-3-pyrazolidone 1-p-chlorphenyl-3 -pyrazolidone 1-phenyl-5-phenyl-3-pyrazolidone l-phenyl-5-methyl-3-pyrazolidone l-acetaminophenyl-3-pyrazolidone
- the substances are all known per se and are, for example, described in the article by J. D. Kendall, Brit. J. phot. (1951) 5 39.
- the concentration ratio between 3-pyrazolidone and o-phenylenediamine can vary within wide limits and can be adapted by means of a few preliminary tests to the requirements of the special copying process or to the properties of the color reversal material which is used.
- the aqueous developer composition according to the invention contain in dissolved form between 2-10 g., preferably 46 g.', per liter of each of the developing agents according to the invention, preferably o-phenylenediamine and l-phenyl- 3-pyrazolidone.
- the developer composition has a pH value of between 8.5 to 11.5, preferably between 10 to 11.
- the developer combination according to the invention is in principle independent of the nature of the photographic color material.
- the color couplers can be incorporated into the emulsion layer in a dissolved diflusion-resistant form. According to another method the color coupler is first dissolved in an oily organic material and this combination is then dispersed in a finely divided state throughout the emulsion.
- the developer according to the invention can also be used in those reversal processes in which the so-called Successive Colorant Formation is applied. In this process the color coupler is incorporated into the color-forming developer composition. The successive color formation in each of the single layers of a multilayer material is obtained by controlled penetration of the processing solution.
- the developers according to the invention can also contain the usual additions of stabilizers, antioxidants, valkalizing substances, etc.
- Example 1 A multi-layer material on a paper support, containing a silver bromide layer with 3-(p-stearoylamino'benzoylacetamino) isophthalic acid as yellow coupler, as well as two silver chloride layers with 1 (3 sulpho 4- phenoxy) phenyl 3 heptadecyl 5 pyrazolone as magenta coupler and N octadecyl 1 hydroxy 4- sulpho 2 naphthamide as cyan coupler, is exposed and developed at a pH value of 10.0 for 4-5 minutes at 20 C. in a first reversal developer having the following composition:
- the material After rinsing, the material is subsequently exposed in dilfused light and developed for 8 minutes in the following color developer:
- Example 2 Black-and-white photographic reversal paper is exposed to the object to be reproduced and developed in the following first developer at a pH value of 10.0 for 5-6 minutes at 20 C.
- the paper is rinsed and bleached for 5 minutes with:
- Potassium dichromate g 5 Concentrated sulphuric acid cc 5 Made up with water to 1 liter.
- the aqueous developer composition may contain in addition to the developing agents the other ingredients of a typical developing solution such as preservatives or anti-oxidants for instant alkali-metal sulfites or bisulfites in particular sodium sulfite or hydroxylamine; alkalis such as alkalimetal carbonates, borates or phosphates especially sodium carbonate; restrainers or antifo-gging agents such as p0- tassium bromide or benzotriazole or derivatives thereot; calcium precipitants or sequestering agents to prevent precipitation in hard water such as sodium tetraphosphate, ethylenediaminetetraacetic acid and the like.
- a typical developing solution such as preservatives or anti-oxidants for instant alkali-metal sulfites or bisulfites in particular sodium sulfite or hydroxylamine; alkalis such as alkalimetal carbonates, borates or phosphates especially sodium carbonate; restrainers or antifo-gging
- a photographic reversal black-and-white silver halide developer formulation having sodium sulfite in a proportion low enough to avoid dissolving silver halide from a silver halide emulsion, o-phenylene diamine, a 3- pyrazolidone in which the 1, 4 and 5 positions can be substituted by phenyl or alkyl of up to 4 carbons, and sufficient alkalizing agent to give the developer at pH between 8.5 and 11.5, the o-phenylene diamine and the 3-pyrazolidone being in the ratio of from 60:40 to 40:60.
- step (i) thereafter fixing the photographic material, the improvement according to which developing step (b) is effected with the developer formulation of claim 1.
- a process for the production of a photographic color-reversal image which comprises (a) exposing a light-sensitive silver halide photographic multi-layer material to an object to be reproduced; (b) developing the exposed photographic material in an aqueous developing composition containing a black-an-d-White developer; (c) rinsing the developed photographic material with water; ((1) subjecting the rinsed and developed material to a non-imagewise uniform exposure to actinic radiation; (e) developing the thus exposed material in the presence of color couplers in an aqueous developing composition containing a color-forming developer, the oxidation products of which are capable of reacting with said color coupler to form a dye, and (f) thereafter bleaching and fixing the photographic material; the improvement according to which developing step (b) is effected with the developer formulation of claim 1.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEA41160A DE1253049B (de) | 1962-09-15 | 1962-09-15 | Waessriger Schwarz-Weiss-Entwickler fuer die photographische Umkehrverarbeitung farbphotographischer Materialien |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3295975A true US3295975A (en) | 1967-01-03 |
Family
ID=6932361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US304660A Expired - Lifetime US3295975A (en) | 1962-09-15 | 1963-08-26 | Black-and-white developer for photographic reversal processes |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3295975A (en)) |
| BE (1) | BE637358A (en)) |
| CH (1) | CH442980A (en)) |
| DE (1) | DE1253049B (en)) |
| GB (1) | GB988125A (en)) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3883354A (en) * | 1971-10-12 | 1975-05-13 | Minnesota Mining & Mfg | Color reversal process and developer |
| US4891309A (en) * | 1987-06-04 | 1990-01-02 | Konica Corporation | Process for producing silver halide photographic paper |
| US5098819A (en) * | 1990-01-31 | 1992-03-24 | Knapp Audenried W | Non-toxic photographic developer composition |
| US5110715A (en) * | 1988-10-20 | 1992-05-05 | Agfa Gavaert Aktiengesellschaft | Photographic reversal process |
| US5491050A (en) * | 1993-03-22 | 1996-02-13 | Eastman Kodak Company | Method of processing originating photographic elements containing tabular silver chloride grains bounded by (100) faces |
| DE19742490C1 (de) * | 1997-09-26 | 1999-02-04 | Agfa Gevaert Ag | Fotografischer Schwarz-Weiß-Umkehrerstentwickler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB768071A (en) * | 1954-03-18 | 1957-02-13 | Agfa Ag | Photographic developer |
| US2981623A (en) * | 1954-03-15 | 1961-04-25 | Agfa Ag | Photographic developers |
| US3021212A (en) * | 1959-08-14 | 1962-02-13 | Eastman Kodak Co | Developers for photographic reversal processes |
-
0
- BE BE637358D patent/BE637358A/xx unknown
-
1962
- 1962-09-15 DE DEA41160A patent/DE1253049B/de active Pending
-
1963
- 1963-08-21 CH CH1032363A patent/CH442980A/de unknown
- 1963-08-26 US US304660A patent/US3295975A/en not_active Expired - Lifetime
- 1963-09-13 GB GB36201/63A patent/GB988125A/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2981623A (en) * | 1954-03-15 | 1961-04-25 | Agfa Ag | Photographic developers |
| GB768071A (en) * | 1954-03-18 | 1957-02-13 | Agfa Ag | Photographic developer |
| US3021212A (en) * | 1959-08-14 | 1962-02-13 | Eastman Kodak Co | Developers for photographic reversal processes |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3883354A (en) * | 1971-10-12 | 1975-05-13 | Minnesota Mining & Mfg | Color reversal process and developer |
| US4891309A (en) * | 1987-06-04 | 1990-01-02 | Konica Corporation | Process for producing silver halide photographic paper |
| US5110715A (en) * | 1988-10-20 | 1992-05-05 | Agfa Gavaert Aktiengesellschaft | Photographic reversal process |
| US5098819A (en) * | 1990-01-31 | 1992-03-24 | Knapp Audenried W | Non-toxic photographic developer composition |
| US5491050A (en) * | 1993-03-22 | 1996-02-13 | Eastman Kodak Company | Method of processing originating photographic elements containing tabular silver chloride grains bounded by (100) faces |
| DE19742490C1 (de) * | 1997-09-26 | 1999-02-04 | Agfa Gevaert Ag | Fotografischer Schwarz-Weiß-Umkehrerstentwickler |
| US6350563B1 (en) | 1997-09-26 | 2002-02-26 | Agfa-Gevaert | Photographic black-and-white reversal first developer |
Also Published As
| Publication number | Publication date |
|---|---|
| BE637358A (en)) | |
| GB988125A (en) | 1965-04-07 |
| CH442980A (de) | 1967-08-31 |
| DE1253049B (de) | 1967-10-26 |
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